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Overview

This 1-port serial device server is an effective serial-over-IP solution that lets you connect to, configure, and remotely manage an RS232 serial device over a LAN (Local Area Network).

For more control options, the device server is compatible with the free, StarTech.com Serial Device Application Software (NETRSAPP). When coupled with the NETRS2321P, this handy application for iOS, Android, and Chrome Browser lets you build a custom serial control interface that’s tailored to your specific application.

Access your serial devices remotely

The versatile device server is designed to function seamlessly with your integrated serial ports, while offering baud rates faster than many other device servers (up to 460.8Kbps).The device server provides the tools you need to communicate with remote RS-232 devices as if they were directly connected.

Flexible setup and operation

It offers versatile browser-based or Virtual COM port software configuration for customizing the device to suit your application. Plus, the software communicates directly with the device server, so it can be used in Virtual Machine (VM) environments if you have multiple VMs sharing the same set of hardware.

The device server also offers remote Telnet configuration and support for IP, HTTP, ICMP, DHCP, ARP, TCP and UDP protocols.

Aluminum housing provides durability you can count on

With a sturdy aluminum housing and DIN rail or surface mounting brackets, the serial device server provides a durable remote serial interface for industrial automation, security, Point of Sale and many other applications.

Data Sheets

Frequently Asked Questions

Before You Buy

Virtual COM port

One of the most common applications of a network serial device is to use it to make a standard serial device accessible on a network. To do this, you need to connect a standard serial device to the DB-9 port on the network serial device. Next you need to connect the network serial device to a TCP/IP network using an Ethernet connection, and then install software on a client machine in order to access the network serial device. The software on the client machine communicates with the network serial device and creates (maps) a virtual COM port on your computer system. The virtual COM port is identical to a physical COM port and can be used in the same way.

Serial IP extender

You can use two network serial devices to extend a serial connection over a TCP/IP network. To do this, you need to configure one serial device as a client and the other as a server. The client and server are configured to transmit and receive data to their respective IP addresses and TCP ports. The serial settings must match for all connected serial devices, including the UART on both units. Depending on the serial device that you are using, you can use the provided software or the web interface to set the configurations.

UDP to serial adapter

You can use a network serial device to translate UDP data to a standard serial connection. The serial device is configured to listen for UDP traffic from specific IP addresses and ports, and will asynchronously transmit the data out of the serial port on the device. To do this, you need to configure UART on the network serial device to match the specifications of the serial receiver.

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Installation

VCOM is software provided to create a virtual serial port on your computer using the serial over IP. When you set it up properly, the network serial devices operate as though they are connected to a physical serial port.

Install software

Before you configure the VCOM software, make sure that you have downloaded and installed the latest software from the StarTech.com website. To download the driver, navigate to http://www.startech.com/Support and enter the part number.

Configure the software

When you have configured your setup so the network serial device can be pinged on the same subnet as the computer, click Search in VCOM to use the software to detect the network serial device. If the network serial device is on a different network than your computer, you can click Search by IP and enter a range of IP addresses to search by.

To configure each network serial device individually, select the device and click Configure.

You can use the VCOM software to do any of the following:

In Administrator, you can change the IP configuration of the unit.

In UART, you can configure the serial port settings. Typically, you only modify these settings if the unit is going to be a serial client in an IP serial extender setup.

In TCP, you can configure the client or server mode. For basic operation in VCOM, you need to set the serial device unit to Server. You do not need to configure anything to use the serial network device in UDP mode.

When you have correctly configured the network serial device for your network, you must map a COM port in VCOM to use the serial port on the network serial device. To map the COM port, complete the following:

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How to

Connect the serial device directly to the computer and ping the device.

Connect to the web interface (if there is one) or connect using the included software.

Before you begin, make sure that the serial device is on the same network and subnet. For more information, see this FAQ: http://www.startech.com/faq/serial_ip_networks_and_subnets. If the device starts with an IP address that is not on your subnet, change your IP address to match the subnet being used before you continue.

Ping the serial device

If the serial device and your computer are on the same network and subnet, try pinging the device.

To ping the device using a computer that is running a version of Windows XP, do the following:

To ping the device using a computer that is running a version of Mac OS, do the following:

Double-click the hard drive.

Double-click Applications > Utilities > Network Utility.

Click the Ping tab.

Enter the IP address in the Please enter the network address to ping field.

Enter the number of packets that you want to test with.

If you receive replies from the IP address, then you can see the device on the network and the issue is with something else.

Connect the serial device directly to the computer

To connect the serial device directly to the computer that you are troubleshooting with, complete the following:

Use a crossover Ethernet cable to connect the device and the computer.

Try pinging the device again.

If you cannot ping the device, use a different computer, Ethernet cable, and serial device (if one is available).

Note: The second computer will need to be on the same network and subnet as the serial over IP device.

If you still cannot ping the device, contact support.

Make sure that you are working in a secure environment

Unplug the connection between your modem and your router.

Disable any firewalls (especially Windows Firewall), antivirus programs, and security programs that are currently running.

Try accessing the web interface (if the device has one) or try to connect using the included software.

If you still cannot connect to the device's web interface or by using the included software, contact support.

If you can access the web interface or connect using the included software, one at a time turn on your firewalls, antivirus programs, and security programs. Each time that you turn on software and cannot connect to the web interface or by using the included software, add an exception for the serial device to what you last re-enabled.

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Troubleshooting

In order for the serial device and your computer to communicate to each other, they both need to be on the same physical network and the same subnet.

To connect your serial device and your computer to the same physical network, plug both devices into the same router.

Typically, in order for devices to be on the same subnet, the first three numbers of the IP address must match. The fourth number of the IP address must be different, as two devices cannot have the same IP address. For example, if your computer’s IP address is 192.168.0.1, then the subnet is 192.168.0.XXX. You can replace the XXX with any number, as long as it is not currently in use by another device.

Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. Windows XP comes with Hyper Terminal.

When the session is open, anything you type into it you should see. The loopback test fails when you cannot see what you are typing.

If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port.

You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session. When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.

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No, if the NETRS2321P is working as expected, you don't need to update the firmware. If you purchased the NETRS2321P before August, 2014, you can perform a firmware update, but only under the supervision of a StarTech.com technical advisor. If you update the firmware incorrectly, the NETRS2321P will stop working.

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You should not upgrade your device's firmware if you do not have any issues with the functionality of your device. The only time you should consider an upgrade is if you are experiencing a problem with the device, and you have confirmed that the firmware addresses this problem. You can confirm this is the case by reviewing the documentation included with the firmware or by consulting with our Technical Support team. Incorrectly upgrading firmware can result in diminished performance so it is best to contact StarTech.com if you would like to perform this operation.